Cardiff weather in August 2025

Expect 20°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Cardiff in August. Check more long-term weather averages for Cardiff in August before you book your next holiday to Wales in 2025/2026.

  • 20°C maximum daytime temperature in August in Cardiff20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 15 days with some rainfall in August in Cardiff15
    15 days with some rainfall
  • 12°C minimum night-time temperature in August in Cardiff12
    12°C min night temperature
  • 15 hours of daylight per day in August in Cardiff15
    15 hours of daylight per day
  • No heat & humidity in August in Cardiff0
    No heat & humidity
  • 81 mm monthly rainfall in August in Cardiff81
    81 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in Cardiff6
    6 (High) UV index
  • 18°C sea temperature in August in Cardiff18
    18°C sea temperature

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The August weather guide for Wales (Cardiff) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Wales

How hot is it in Cardiff in August?

Daytime temperatures usually reach 20°C in Cardiff in August, falling to 12°C at night.

How sunny is it in Cardiff in August?

There are normally 6 hours of bright sunshine each day in Cardiff in August - that's 41% of daylight hours.

How warm is the sea around Cardiff in August?

The average sea temperature around Cardiff in August is 18°C.

Does it rain in Cardiff in August?

There are usually 15 days with some rain in Cardiff in August and the average monthly rainfall is 81mm.

Cardiff August sunrise & sunset times

Browse the sunrise and sunset times for Cardiff in August 2025. Select a month to view Cardiff sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:37 20:00
Saturday, 16th August 2025 05:00 19:33
Sunday, 31st August 2025 05:24 19:01

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